What type of mortar should be used with glass block?
For exterior applications the building codes allow for the use of types N or S mortar. Regardless of the type used, Pittsburgh Corning recommends the use of Portland cement (as opposed to the use of Masonry Cement), hydrated lime and sand that conforms to ASTM C-144 standard. Hydrocide powder, an integral type water repellent available from Sonenborn Building Products, may also be used. The use of accelerators and/or acid washing is not recommended. What size mortar joint should be used with glass block? Typically in straight flat walls both horizontal and vertical joints vary in width between inch and inch. Reinforced joints should not be less than inch, otherwise, the cross wires of the reinforcing could point load the glass block and cause breakage. In curved walls the inside vertical mortar joints should not be less than 1/8 inch wide and the outside vertical mortar joint should not be more than 5/8 inch wide. What is the rough opening required when installing glass block with mort
